Fiend Artisan gets +1/+1 for each creature card in your graveyard.

{X}{B/G}, {T}, Sacrifice another creature: Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle. Activate only as a sorcery.

When Massacre Wurm enters the battlefield, creatures your opponents control get -2/-2 until end of turn.

Whenever a creature an opponent controls dies, that player loses 2 life.

Vigilance, deathtouch, haste

Questing Beast can't be blocked by creatures with power 2 or less.

Combat damage that would be dealt by creatures you control can't be prevented.

Whenever Questing Beast deals combat damage to an opponent, it deals that much damage to target planeswalker that player controls.

Trample, haste

If you would put one or more counters on a permanent or player, put twice that many of each of those kinds of counters on that permanent or player instead.

If an opponent would put one or more counters on a permanent or player, they put half that many of each of those kinds of counters on that permanent or player instead, rounded down.

Trample

Whenever you tap a land for mana, add one mana of any type that land produced.

Whenever an opponent taps a land for mana, that land doesn't untap during its controller's next untap step.